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1. What are the commonly used reaction devices in catalytic hydrogenation experiments?
The commonly used reaction devices in catalytic hydrogenation experiments are mainly divided into three categories: intermittent high-pressure reaction vessels, continuous fixed bed reaction devices, and micro fluidized bed/microchannel hydrogenation devices, which are suitable for different experimental scales and working conditions.
1. Intermittent high-pressure reactor 1 It is the most commonly used hydrogenation device in the laboratory, mainly used for exploratory experiments such as small batch raw material screening and process parameter optimization. 2. The core structure includes a reaction kettle body, mechanical/magnetic stirring system, heating and temperature control unit, hydrogen inlet and exhaust channels, pressure and temperature monitoring module, and some models are equipped with interfaces for quick sampling. 3. Conventional laboratory models have a volume coverage of 50mL~5L, a pressure resistance range of 0.1~20MPa, and a temperature control accuracy of ± 1~5 ℃, which can meet the needs of most conventional hydrogenation experiments. 4. Before operation, inert gas needs to be used to replace the air in the kettle. After the reaction is completed, pressure relief and cooling are required before discharging. The whole process needs to be carried out in an explosion-proof area.
2. Continuous fixed bed reactor 1 Suitable for experimental verification of pilot scale or continuous hydrogenation processes, it can simulate industrial continuous production conditions. 2. The entire device includes a raw material metering unit (liquid phase feed pump, gas phase mass flow meter), preheater, fixed bed
III. Micro fluidized bed/microchannel hydrogenation device 1 Design for hydrogenation reactions with strong heat release and high mass transfer efficiency requirements, such as selective hydrogenation of alkynes and hydrogenation reduction of nitrobenzene. Micro fluidized beds drive catalyst particle fluidization through gas flow, greatly enhancing mass and heat transfer between gas-solid and gas-liquid solid phases, avoiding local overheating and side reactions. Micro channel hydrogenation devices compress the reaction space into millimeter level channels and achieve rapid mass and heat transfer through a large specific surface area, which can achieve precise control of millisecond level residence time and is commonly used for rapid research and development of fine chemical hydrogenation. Both types of devices are equipped with real-time online analysis units, which can quickly obtain continuous and stable reaction data. All hydrogenation experimental devices must be equipped with safety facilities such as hydrogen leak alarm and explosion-proof pressure relief. The operation must be carried out by professional personnel trained in hazardous chemical operations in a ventilated and explosion-proof are
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